GSG9 ( a manufacturer in AZ) is making a Mp7 in 5.7 You talking about this thing? http://www.shoparizonafirearms.com/handguns/semi-automatic-handguns/masterpiece-arms-defender-side-charging-57x28-5-20rd-threaded-barrel-13 If so, we already have a thread about it http://www.fivesevenforum.com/viewto...